libcamera: v4l2_device: Move start of frame detection to V4L2Device

The V4L2_EVENT_FRAME_SYNC event may occur on both V4L2 video-devices
(V4L2VideoDevice) and sub-devices (V4L2Subdevice). Move the start of
frame detection to the common base class of the two, V4L2Device.

There is no functional change.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

1 files changed, 1 insertions, 74 deletions

diff --git a/src/libcamera/v4l2_videodevice.cpp b/src/libcamera/v4l2_videodevice.cpp
index ac3c8c7d..5ee1b479 100644
--- a/src/libcamera/v4l2_videodevice.cpp
+++ b/src/libcamera/v4l2_videodevice.cpp
@@ -481,8 +481,7 @@ const std::string V4L2DeviceFormat::toString() const
  * \param[in] deviceNode The file-system path to the video device node
  */
 V4L2VideoDevice::V4L2VideoDevice(const std::string &deviceNode)
-	: V4L2Device(deviceNode), cache_(nullptr), fdBufferNotifier_(nullptr),
-	  fdEventNotifier_(nullptr), frameStartEnabled_(false)
+	: V4L2Device(deviceNode), cache_(nullptr), fdBufferNotifier_(nullptr)
 {
 	/*
 	 * We default to an MMAP based CAPTURE video device, however this will
@@ -575,10 +574,6 @@ int V4L2VideoDevice::open()
 	fdBufferNotifier_->activated.connect(this, &V4L2VideoDevice::bufferAvailable);
 	fdBufferNotifier_->setEnabled(false);
 
-	fdEventNotifier_ = new EventNotifier(fd(), EventNotifier::Exception);
-	fdEventNotifier_->activated.connect(this, &V4L2VideoDevice::eventAvailable);
-	fdEventNotifier_->setEnabled(false);
-
 	LOG(V4L2, Debug)
 		<< "Opened device " << caps_.bus_info() << ": "
 		<< caps_.driver() << ": " << caps_.card();
@@ -668,10 +663,6 @@ int V4L2VideoDevice::open(int handle, enum v4l2_buf_type type)
 	fdBufferNotifier_->activated.connect(this, &V4L2VideoDevice::bufferAvailable);
 	fdBufferNotifier_->setEnabled(false);
 
-	fdEventNotifier_ = new EventNotifier(fd(), EventNotifier::Exception);
-	fdEventNotifier_->activated.connect(this, &V4L2VideoDevice::eventAvailable);
-	fdEventNotifier_->setEnabled(false);
-
 	LOG(V4L2, Debug)
 		<< "Opened device " << caps_.bus_info() << ": "
 		<< caps_.driver() << ": " << caps_.card();
@@ -689,7 +680,6 @@ void V4L2VideoDevice::close()
 
 	releaseBuffers();
 	delete fdBufferNotifier_;
-	delete fdEventNotifier_;
 
 	V4L2Device::close();
 }
@@ -1545,74 +1535,11 @@ FrameBuffer *V4L2VideoDevice::dequeueBuffer()
 }
 
 /**
- * \brief Slot to handle V4L2 events from the V4L2 video device
- * \param[in] notifier The event notifier
- *
- * When this slot is called, a V4L2 event is available to be dequeued from the
- * device.
- */
-void V4L2VideoDevice::eventAvailable([[maybe_unused]] EventNotifier *notifier)
-{
-	struct v4l2_event event{};
-	int ret = ioctl(VIDIOC_DQEVENT, &event);
-	if (ret < 0) {
-		LOG(V4L2, Error)
-			<< "Failed to dequeue event, disabling event notifier";
-		fdEventNotifier_->setEnabled(false);
-		return;
-	}
-
-	if (event.type != V4L2_EVENT_FRAME_SYNC) {
-		LOG(V4L2, Error)
-			<< "Spurious event (" << event.type
-			<< "), disabling event notifier";
-		fdEventNotifier_->setEnabled(false);
-		return;
-	}
-
-	frameStart.emit(event.u.frame_sync.frame_sequence);
-}
-
-/**
  * \var V4L2VideoDevice::bufferReady
  * \brief A Signal emitted when a framebuffer completes
  */
 
 /**
- * \brief Enable or disable frame start event notification
- * \param[in] enable True to enable frame start events, false to disable them
- *
- * This function enables or disables generation of frame start events. Once
- * enabled, the events are signalled through the frameStart signal.
- *
- * \return 0 on success, a negative error code otherwise
- */
-int V4L2VideoDevice::setFrameStartEnabled(bool enable)
-{
-	if (frameStartEnabled_ == enable)
-		return 0;
-
-	struct v4l2_event_subscription event{};
-	event.type = V4L2_EVENT_FRAME_SYNC;
-
-	unsigned long request = enable ? VIDIOC_SUBSCRIBE_EVENT
-			      : VIDIOC_UNSUBSCRIBE_EVENT;
-	int ret = ioctl(request, &event);
-	if (enable && ret)
-		return ret;
-
-	fdEventNotifier_->setEnabled(enable);
-	frameStartEnabled_ = enable;
-
-	return ret;
-}
-
-/**
- * \var V4L2VideoDevice::frameStart
- * \brief A Signal emitted when capture of a frame has started
- */
-
-/**
  * \brief Start the video stream
  * \return 0 on success or a negative error code otherwise
  */